It was a knock-out competition for non professional english teams. Until 2006 it was not played by the four non professional teams that qualifiy for round of 16 of Powergen Cup. Since then, non professional teams were excluded from Anglo-Welsh Cup and played only the National Trophy. The cup was abandoned in 2009 when also RFU Championship teams turned professionals.
www.bbc.com - BBC site
www.englandrugby.com - English rugby union site (former www.rfu.com).
www.ncarugby.org - National league club association site
en.wikipedia.org/wiki/EDF_Energy_Trophy - Wikipedia pages about National Trophy
Every site was scanned using also web.archive.org
Many data were found on Rothmans Rugby Union Yearbook of various years.